P0337

DTC P0337






GENERAL DESCRIPTION
A Crankshaft Position Sensor (CKPS) is a magnetic type sensor that generates voltage using a sensor and a target wheel mounted on the crankshaft; there are 58 slot in the target wheel where one is longer than the others. When the slot in the wheel aligns with the sensor, the sensor voltage outputs low. When the metal (tooth) in the wheel aligns with the sensor, the sensor voltage outputs high. During one crankshaft rotation there are 58 rectangular signals and one longer signal. The ECM/PCM calculates engine RPM by using the sensor' s signal and controls the injection duration and the ignition timing. Using the signal differences caused by the longer slot, the ECM/PCM identifies which cylinder is at top dead center.

DTC DESCRIPTION
If frequency counter of the gap correction is retarded over 265, ECM/PCM sets DTC P0337.

DTC Detecting Condition:

Schematic Diagram - A/T:

Schematic Diagram - M/T:

Signal Waveform And Data:

MONITOR SCANTOOL DATA
1. Connect scantool to DLC(Data Link Cable).
2. Engine start.




3. Monitor the "CKP" parameters on the scantool.
4. Are the parameters displayed correctly?

YES - Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM/PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of vehicle Repair" procedure.

NO - Go to "Terminal and connector inspection" procedure.

TERMINAL AND CONNECTOR INSPECTION
1. Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
3. Has a problem been found?

YES - Repair as necessary and go to "Verification of vehicle Repair" procedure.

NO - Go to "CKPS circuit inspection" procedure.

SIGNAL CIRCUIT INSPECTION
1. Check Open in signal circuit.
a. Key "OFF".
b. Disconnect CKPS connector.
c. Key "ON".




d. Measure the voltage between terminal 1 of CKPS harness connector and chassis ground. Then, measure the voltage between terminal 2 of CKPS harness connector and chassis ground.

Specification : Approx 2.5 V

e. Is the measured voltage within specification?

YES - Go to "Component inspection" procedure.

NO - Go to "Check Short to ground in signal circuit" procedure.

2. Check Short to ground in signal circuit.
a. Key "OFF".
b. Disconnect CKPS connector and ECM/PCM connector.




c. Measure the resistance between1 of CKPS harness connector and chassis ground. Then, measure the resistance between terminal 2 of CKPS harness connector and chassis ground.

Specification : Infinite

d. Is the measured resistance within specifications?

YES - Repair Open in signal circuit and then, go to "Verification of Vehicle Repair" procedure.

NO - Repair Short to ground in signal circuit and then, go to "Verification of Vehicle Repair" procedure.

COMPONENT INSPECTION
1. Check CKPS.
a. Key "ON". (Don't disconnect sensors.)
b. Select "vehicle scopemeter" in the menu, and connect channel A of scantool with terminal 1 of CKPS harness connector.

Specification:

c. Engine start. And check the signal waveforms.
d. Is the measured signal waveform O.K?

YES - Go to "Check ECM/PCM" as follows.

NO
- Substitute with a known - good CKPS and check for proper operation.
- If the problem is corrected, replace CKPS and go to "Verification of Vehicle Repair" procedure.

2. Check ECM/PCM.
a. IG "OFF".
b. Connect scantool and Engine "ON".
c. Select simulation function on scantool.




d. Simulate frequency(Hz) at terminal 1 of CKPS signal connector.
e. Does the signal value of CKPS change according to simulation frequency?

YES - Thoroughly check connectors for looseness, poor connection, bending, corrosion,contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.

NO
- Substitute with a known - good ECM/PCM and check for proper operation.
- If the problem is corrected, replace ECM/PCM and go to "Verification of Vehicle Repair" procedure.

VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
2. Clear the DTCs and Operate the vehicle within DTC Enable conditions in General information.
3. Are any DTCs present ?

YES - Go to the applicable troubleshooting procedure.

NO - System is performing to specification at this time